Replaceable tooth.



F. LA-GHAPE LLB. REPLAGEABLE TOOTH. 'APPLIOATION FILED JAR-21, 1908.

Patented m 24, 1910;

fl' 5 I v 7 7 W WITNESSES: I 'INVBNTJOR amz's da velig YATTOR theconstruction and combination of ports baked a locking member orprojecting bolt senses.

To all whom it mag concern:

Be it known that l, FRANCIS LA Ctrartsmn, a citizen of the UnitedStates, residing in the city and county of San Francisco State ofCalifornia, have invented new and, useful lmnrovements in ReplaceableTeeth, of which too following is a. specification.

This invention relates to dentistry, and pertains especially toartificial teeth and bridge Work.

The object of the present invention is to provide an interchangeable andreplaceable artificial tooth, which will have the characteristics ofbeing replaceable on a bridge without the necessity of taking oil thebridge; which. will be made strong end durabio and thereby lessen to aminimum the likelihood of the tooth breaking or the necessity of itsover having to he .repiacedgthot it will be so supported that no lateralor other motion of the tooth on the bridge will be possible; that aconsiderable savio of solder and gold will be efi ected in the brld econstruction, and that altogether itwill a d strength to the bridge, beartistic. in appearance, sanitary, strong, and simple and easy tomanipulate.

"The invention consists of the parts and as. hereinafter more fullydescribed and. claimed, having reference to the accompanylug-drawings,in which Figure 1 is a perspective view of a. porcelain tooth with itsstud. Fig. 2 represents views of the opposite sides of the backingplate. Figs. and. 4 are side views partially broken away, of a toothwith its backing plate in place. Fig. 5 is a front view of a pluralityof teeth showing one tooth removed.

A represents a porcelain tooth having a fiat back, and into which toothhas been or stud 2. Any suit-able number of interlocking belts orprojections may be used, but I prefer to use a single one placedcentrally in the tooth and securely anchored therein to give a solid andfirm construction. This bolt has an oblong shank with the three-flangedhead 3.

i is a backing-plate which is secured to the bridge by solder orotherwise. This. backing-plete has a slot 5 to receive the projection 2on the tooth the slot being made sufficiently Wide atthe top to admitthebolt egaeemmfion of lemons eetent. Application first. January 31,Eterie'i tt'o. err

to embrace the shank of the bolt behind'the head 3, and prevent theoutward withdrawal of the tooth when the bolt hes been inserted into theslot and slipped down into piece. The length thickness of the olate, sothat the parts will have asnng sliding fit; so thst Wlienthe tooth isfinally secured or cemented to the hocking-plate, they will precticolly'consti tote one unitary rigid stroctln'ea I 1 of the shank correspondsto the The back of the hacking-plate has 2 cupshaped projection 6forming a housing ing the solder from contact with the bolt or u everthe slot 5, both for the purpose of circled tooth, and constituting apocket or chemher for the cement in which the inserted bolt is embeddedand by which the "tooth is finally and permanently secured. in place.This cup or housing member 6 is secured to the backing-piste by anysuitshle means; either by sweating, or solder, or otherwise.-

By halting the locking member 2 into the porcelain tooth the latter isnot weakened in any Way, is as strong as a facing of this sort be made.

and having it n=-rrowed downward extension The facing and backing beingjoined by cement term a solid, rigid structure to resist strains andtensions, and the strength of practically the strength of the its centerallows for a long overlap; and the bolt shank being square will notallow a, lateral or other motion to the tooth.

The, projecting cup or housing 6 on the hack oi. the backing-plateresults in a considerable saving of solder, as there is no need forsolder over the box itself. Also, the box-shaped cup is a benefit tofacing with solid cusps, as it helps to build out the solder with asaving to the bridge maker.

/Vhile there is little liability of a tooth of this character breakingoff aiter, being once put on to the bridge, at the same-time, thisstructure permits a tootl if broken, to be readily replaced, Withouttaking out the bridge. I

By making the interlocking proiections 2 and the hocking-plates withtheir corresponding elongo. slots of uniform and standard size, itpermits interchangeabilityfor all parts in contact Having thus describedmy invention, what I claim and desire to secure by Letters Pat.- ent is-The combination with a veneer having a headed lug projecting from itsrear face, of a backing comprising two plates, one being arrangedparallel to the rear face of said Veneer and having a key-skit toreceive said. lug, the other plate being imper'forate and furnished witha depression coverim the slot and lug and secured around its e ge is theslotted plate, whereby a closed recess is formed containing the head offhe lug and I adapted to be filled with. cement for retain- 10 ing saidhead.

In testimony: whereof I have hereunto setmy hand in presence of twosubscribing Witnesses.

FRANCIS LA CHAPELLE.

\Vitnesses LEONARD DARMs, lWAR'rxN ARONSOHN.

